A Practical Solvating Agent for the Chiral NMR Discrimination of Carboxylic Acids
作者:Seon-mi Kim、Kihang Choi
DOI:10.1002/ejoc.201100692
日期:2011.7.18
A bisimidazoline compound has been prepared as a new chiral solvating agent starting from isophthalaldehyde and (S,S)-1,2-diphenylethylenediamine through a single-step synthesis. In the presence of one equivalent of this reagent, carboxylic acid racemates show 1H NMR chemical shift nonequivalences large enough for the discrimination of the enantiomers. Studies with related compounds showed that the
以间苯二醛和 (S,S)-1,2-二苯基乙二胺为原料,通过一步合成制备了一种双咪唑啉化合物,作为一种新型手性溶剂化剂。在存在一当量的这种试剂时,羧酸外消旋物显示出足够大的 1H NMR 化学位移非等价性,足以区分对映异构体。对相关化合物的研究表明,1,3-二取代结构对双咪唑啉化合物的酸溶剂化能力至关重要。